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Help Round pipe in tank

08-12-2008, 08:34 AM

How do I make a precision fit of a 3 inch round pipe into a round tank?

I need a 3 inch round pipe installed in the 24 inch round tank. I Need the pipe to perfectly vertical but it will be offset a bit from straight up on the tank if that makes sense. Instead of being just straight down into the center of the tank it will be offset to one side just bit.

Comment

The other way would be to cut the 3" pipe to fit and then trace around it with soapstone and cut the hole with a torch.
There is a site that has a program to make patterns for you, I don't know if I can find it though. You can also make your own pattern but its hard to explain how to do it.
This came up a while back on this site and I did my best to describe how to do it and someone else posted a link to the site with the program. You might try the search on this forum to find that thread.

Comment

Your welcome. The sheetmetal shop is one of my favorite sites beside this one. They have a lot of reprints of old books from around the turn of the 20th century. I ordered the DVD of old books and its great, I definitely recommend it.
Here is a link to the site if you want to poke around a little.http://www.thesheetmetalshop.com/index.html

Comment

Even with some guess work you should be able to come close enough to burn it and have it weldable. It would be a big problem if you were to come up an inch off. Heck its so primitive you could hold the thing up there and burn around it till the pipe went thru the hole.